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  | | Understanding the Earth, Revised Edition(2nd Edition) A Reader in the Earth Sciences by I.G. Gass, Peter J. Smith, Et Al., Ian Graham Gass, Open University, The Mit Press Paperback, 384 Pages, Published 1973 by The Mit Press ISBN-13: 978-0-262-57038-1, ISBN: 0-262-57038-6 |
 | | Understanding the Earth(2nd Edition) by I.G. Gass, P. L. Smith, R. C. Wilson, Peter J. Smith, Ian Graham Gass Paperback, 388 Pages, Published 1977 by Artemis Press ISBN-13: 978-0-85141-308-2, ISBN: 0-85141-308-0 "During the past decade, research by oceanographic geophysicists which has led to the wide acceptance that continents drift about the face of the earth and to the concept of sea-floor spreading has culminated in an all-embracing theory known as 'plate tectonics.' This theory draws sea-floor spreading, continental drift, crustal structures, and world patterns of seismic and volcanic activity together as aspects of one coherent picture. No ..." |